How to implement bus and subway inquiry and navigation in uniapp

How to implement bus and subway inquiry and navigation in uniapp

With the development of cities and the growth of population, buses and subways have become the main way for many people to travel. When developing mobile applications, providing bus and subway inquiry and navigation functions can improve user experience and help users plan travel routes more conveniently.

This article will introduce how to implement bus and subway query and navigation functions in uniapp, including querying bus and subway lines, querying site information, querying arrival information, etc., and provide specific code examples.

1. Install the required plug-ins
   In the uniapp project, we can use third-party plug-ins to implement bus and subway query and navigation functions. There are currently multiple plug-ins on the market to choose from, such as uni-simple-router and uni-request. Install these plug-ins through npm and then introduce them into the project.
2. Query bus and subway lines
   To check bus and subway lines, you first need to obtain the city's line information. You can use the bus and subway API to obtain route information by sending an HTTP request.

For example, we can use the uni-request plug-in to send a GET request to obtain line information:

import request from 'uni-request';

// 获取公交地铁线路信息
function getRouteInfo(city) {
  return request.get('http://api.example.com/routes', {
    params: {
      city: city
    }
  });
}

In the above code, we obtain the corresponding line information by passing in the city parameters . The obtained line information can be returned in JSON format, including important information such as line name, starting point and end point.

3. Query site information
   Once the line information is obtained, we can query all site information on the line. By sending an HTTP request, we can get details such as the name, location, etc. of each site.

// 获取站点信息
function getStationInfo(routeId) {
  return request.get('http://api.example.com/stations', {
    params: {
      routeId: routeId
    }
  });
}

By passing in the line ID parameter, we can obtain all site information on the line.

4. Query arrival information
   In addition to obtaining site information, we can also query arrival information on specific lines and sites. By sending an HTTP request, we can get how long it will take the vehicle to arrive at the site at the current time.

// 获取到站信息
function getArrivalInfo(routeId, stationId) {
  return request.get('http://api.example.com/arrival', {
    params: {
      routeId: routeId,
      stationId: stationId
    }
  });
}

When we pass in the line ID and site ID parameters, we can get the arrival information on the line and site.

5. Navigation function
   After querying arrival information, we can provide users with navigation functions to help them plan their travel routes. You can use the map API to mark starting points and destinations on the map and provide route planning functions.

For example, you can use the uni-simple-router plug-in to define the navigation page in the route:

export default [
  {
    path: '/navigation',
    name: 'navigation',
    component: () => import('@/pages/navigation')
  }
]

In the navigation page, we can use the map component to display the starting point and end point, and Provide route planning buttons:

<template>
  <view>
    <map :markers="markers"></map>
    <button @click="routePlanning">开始导航</button>
  </view>
</template>

<script>
export default {
  data() {
    return {
      markers: [
        {
          id: 0,
          latitude: 39.908823,
          longitude: 116.397470,
          iconPath: '/static/start.png'
        },
        {
          id: 1,
          latitude: 39.991523,
          longitude: 116.383039,
          iconPath: '/static/end.png'
        }
      ]
    }
  },
  methods: {
    routePlanning() {
      // 调用地图API进行路线规划
    }
  }
}
</script>

In the above code, we use the map component to display the starting point and end point, and use the button component to provide the route planning button. By calling the map API, we can implement specific navigation functions.

Through the above steps, we can implement bus and subway inquiry and navigation functions in uniapp. By sending HTTP requests to obtain line, site and arrival information, and providing navigation functions on the map, it can help users travel more conveniently using buses and subways.

(The above code examples and APIs are only for illustration, and actual development needs to be adjusted according to specific needs and API documents.)

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